1. How big is your tank?
3 X Small (10, 15 & 29) as well as 2 X 5 gal
1 X Medium (50)
2. How frequently do you do water changes?
Weekly
3. How much water do you change?
Specify in gallons
approx 40%, so 2 gal, 2 gal, 4 gal, 6 gal, 12 gal and 20 gal
4. At what NO3 level would you do...